Methods and apparatus for transmitting and receiving wireless signals in a wireless communication system

Abstract

According to an embodiment of the present invention, a user equipment can obtain the configuration of a reference signal in RRC idle mode or RRC inactive mode, determine the availability of the configured reference signal, and receive the reference signal in RRC idle mode or RRC inactive mode.

Description

Technical Field

[0001] This disclosure relates to wireless communication systems, and more specifically, to a method and apparatus for transmitting and receiving wireless signals. Background Technology

[0002] Typically, wireless communication systems are evolving to provide communication services such as audio communication and data communication by covering a wider range of areas. Wireless communication is a multiple access system capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power, etc.). For example, a multiple access system can be any of the following: Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA). Summary of the Invention

[0003] Technical issues

[0004] The purpose of this disclosure is to provide a method and apparatus for efficiently performing wireless signal transmission / reception processes.

[0005] Those skilled in the art will understand that the purposes that can be achieved using this disclosure are not limited to those specifically described above, and the above and other purposes that can be achieved using this disclosure will become clearer from the following detailed description.

[0006] Technical solution

[0007] In one aspect of this disclosure, a method for receiving signals by a terminal in a wireless communication system is provided. The method may include the steps of: acquiring a configuration of a reference signal for a Radio Resource Control (RRC) idle mode or an RRC inactive mode; determining the availability of the reference signal; and receiving the reference signal in the RRC idle mode or RRC inactive mode based on the determination of the reference signal's availability and the acquired configuration of the reference signal. The terminal may determine the availability of the reference signal based on a specific signal received from a base station. The specific signal may be downlink control information (DCI) carried on a Physical Downlink Control Channel (PDCCH) detected in the RRC idle mode or RRC inactive mode. Based on the DCI indicating the availability of the reference signal, the terminal may assume that it will periodically receive the reference signal in the RRC idle mode or RRC inactive mode.

[0008] The PDCCH carrying DCI can be detected based on the Paging-Radio Network Temporary Identifier (P-RNTI).

[0009] DCI can be a paging DCI or a specific DCI that indicates that a paging DCI will be provided at the paging time (PO).

[0010] A specific DCI may include information about whether the paging DCI includes information indicating the availability of a reference signal.

[0011] A specific DCI can indicate the availability of a reference signal for a specific duration, where the end of the specific duration may be related to the location of the PO.

[0012] The configuration of the reference signal may include information about the periodicity of the reference signal.

[0013] The configuration of the reference signal can be obtained through the System Information Block (SIB).

[0014] The configuration of the reference signal can be obtained in RRC connection mode. Even when the terminal enters RRC idle mode or RRC inactive mode, the terminal can still receive the reference signal in RRC idle mode or RRC inactive mode by maintaining the configuration of the acquired reference signal.

[0015] DCI can indicate the availability of reference signals through short message fields configured based on the 3rd Generation Partnership Project (3GPP).

[0016] The reference signal may include at least one of the channel state information-reference signal (CSI-RS) or the tracking reference signal (TRS).

[0017] In another aspect of this disclosure, a computer-readable recording medium may be provided having a program recorded thereon for performing a signal receiving method.

[0018] In another aspect of this disclosure, a terminal for performing the signal receiving method may be provided.

[0019] In another aspect of this disclosure, an apparatus for controlling a terminal to perform the signal receiving method may be provided.

[0020] In another aspect of this disclosure, a method for transmitting signals by a base station in a wireless communication system is provided. The method may include the steps of: configuring the transmission of a reference signal for a terminal in a Radio Resource Control (RRC) idle mode or an RRC inactive mode; transmitting information indicating the availability of the reference signal; and transmitting the reference signal to the terminal in the RRC idle mode or the RRC inactive mode based on the availability and configuration of the reference signal. The base station may transmit information indicating the availability of the reference signal via a specific signal. The specific signal may be downlink control information (DCI) carried on a Physical Downlink Control Channel (PDCCH) transmitted in the RRC idle mode or the RRC inactive mode. Based on the DCI indicating the availability of the reference signal, the base station may periodically transmit the reference signal to the terminal in the RRC idle mode or the RRC inactive mode.

[0021] In another aspect of this disclosure, a base station for performing the signal transmission method may be provided.

[0022] Beneficial effects

[0023] According to embodiments of this disclosure, RS can be provided in RRC idle / inactive mode. Additionally, the availability of RS can be indicated. Therefore, from the UE's perspective, more energy-efficient RRC idle / inactive mode operation can be achieved, and from the network's perspective, efficient radio resource management can be achieved.

[0024] Those skilled in the art will understand that the effects that can be achieved using this disclosure are not limited to those specifically described above, and other advantages of this disclosure will become clearer from the following detailed description taken in conjunction with the accompanying drawings. Attached Figure Description

[0025] Figure 1 The physical channel used in the 3rd Generation Partnership Project (3GPP) system, which serves as an exemplary wireless communication system, and the general signal transmission method using it are illustrated.

[0026] Figure 2 The structure of a radio frame is shown.

[0027] Figure 3 The resource grid for the time slot is shown.

[0028] Figure 4 An exemplary mapping of physical channels in a time slot is shown.

[0029] Figure 5 This illustrates an exemplary Physical Downlink Control Channel (PDCCH) transmission and reception process.

[0030] Figures 6 to 7 The structure of the control resource set (CORESET) is shown.

[0031] Figure 8 This shows the wake-up signal in LTE.

[0032] Figure 9 This illustrates an example of UE operation according to this disclosure.

[0033] Figure 10 The following illustrates signal transmission and reception according to examples of this disclosure.

[0034] Figure 11 The example shown is the reception of a reference signal by a UE according to this disclosure.

[0035] Figure 12 The flow of a signal transmission / reception method according to an example of this disclosure is shown.

[0036] Figures 13 to 16Examples of communication system 1 and wireless device applicable to this disclosure are shown.

[0037] Figure 17 An exemplary discontinuous reception (DRX) operation applicable to this disclosure is shown. Detailed Implementation

[0038] The embodiments of this disclosure are applicable to various radio access technologies such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA). CDMA can be implemented as radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented as radio technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rate GSM Evolution (EDGE). OFDMA can be implemented as radio technologies such as IEEE 802.11 (Wireless Fidelity (Wi-Fi)), IEEE 802.16 (Global Microwave Access Interoperability (WiMAX)), IEEE 802.20, and Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS using E-UTRA (E-UMTS), and LTE-Advanced (A) is an evolution of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolution of 3GPP LTE / LTE-A.

[0039] As more and more communication devices require greater communication capacity, there is a need for enhanced mobile broadband communications compared to traditional radio access technologies (RATs). Furthermore, the ability to provide various services anytime, anywhere by connecting multiple devices and objects is another important consideration for next-generation communications. Communication system designs considering reliability and latency-sensitive services / UEs are also being discussed. Therefore, the introduction of new radio access technologies incorporating enhanced mobile broadband (eMBB), massive MTC, and ultra-reliable low-latency communication (URLLC) is being discussed. In embodiments of this disclosure, for simplicity, this technology will be referred to as NR (New Radio or New RAT).

[0040] For the sake of brevity, this disclosure primarily describes 3GPP NR, but the technical concepts herein are not limited thereto.

[0041] For background information, definitions of terms and abbreviations related to this disclosure, the following references may be incorporated by way of citation.

[0042] 3GPP LTE

[0043] -TS 36.211: Physical Channels and Modulation

[0044] -TS 36.212: Multiplexing and Channel Coding

[0045] -TS 36.213: Physical Layer Processes

[0046] -TS 36.300: General Description

[0047] -TS 36.321: Media Access Control (MAC)

[0048] -TS 36.331: Radio Resource Control (RRC)

[0049] 3GPP NR

[0050] -TS 38.211: Physical Channels and Modulation

[0051] -TS 38.212: Multiplexing and Channel Coding

[0052] -TS 38.213: Physical layer procedures for control

[0053] -TS 38.214: Physical layer procedures for data

[0054] -TS 38.300: General Description of NR and NG-RAN

[0055] -TS 38.321: Media Access Control (MAC)

[0056] -TS 38.331: Radio Resource Control (RRC) Protocol Specification

[0057] Terms and abbreviations

[0058] -PSS: Master Synchronization Signal

[0059] -SSS: Secondary Synchronization Signal

[0060] -CRS: Cell Reference Signal

[0061] -CSI-RS: Channel State Information Reference Signal

[0062] -TRS: Tracking Reference Signal

[0063] -SS: Search Space

[0064] -CSS: Public Search Space

[0065] -USS: UE-specific search space

[0066] -PDCCH: Physical Downlink Control Channel; PDCCH is used to represent the various structures of PDCCH that can be used for the same purpose in the following description.

[0067] -DCI: Downlink Control Information

[0068] -WUS: Wake-up signal; WUS can be used to indicate other method signals or channels that perform similar functions (e.g., Paging Advance Indication (PEI)).

[0069] In a wireless communication system, a user equipment (UE) receives information from a base station (BS) via a downlink (DL) and transmits information to the BS via an uplink (UL). The information transmitted and received by the BS and UE includes data and various control information, and involves various physical channels depending on the type / purpose of the information transmitted and received by the UE and BS.

[0070] Figure 1 The physical channels used in a 3GPP NR system and the general signal transmission methods using them are shown.

[0071] When the UE is powered on again from a power-off state or enters a new cell, in step S101, the UE performs an initial cell search procedure (e.g., establishing synchronization with the BS). For this purpose, the UE receives a synchronization signal block (SSB) from the BS. The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). The UE establishes synchronization with the BS based on the PSS / SSS and obtains information such as the cell identifier (ID). The UE can obtain broadcast information within the cell based on the PBCH. During the initial cell search process, the UE can receive a DL reference signal (RS) to monitor the DL channel status.

[0072] After the initial cell search, in step S102, the UE can obtain more specific system information by receiving the Physical Downlink Control Channel (PDCCH) and receiving the Physical Downlink Shared Channel (PDSCH) based on the information in the PDCCH.

[0073] In steps S103 to S106, the UE may perform a random access procedure to access the BS. For random access, the UE may send a preamble to the BS on the Physical Random Access Channel (PRACH) (S103) and receive a response message for the preamble on the PDCCH and the corresponding PDSCH (S104). In the case of contention-based random access, the UE may further perform a contention resolution procedure by sending a PRACH (S105) and receiving the PDCCH and the corresponding PDSCH (S106).

[0074] Following the aforementioned process, the UE can receive the PDCCH / PDSCH (S107) and transmit the Physical Uplink Shared Channel (PUSCH) / Physical Uplink Control Channel (PUCCH) (S108), as part of the general downlink / uplink signal transmission process. The control information sent from the UE to the BS is called Uplink Control Information (UCI). UCI includes Hybrid Automatic Repeat and Request Acknowledgment / Nack Acknowledgment (HARQ-ACK / NACK), Scheduling Request (SR), Channel State Information (CSI), etc. CSI includes Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Rank Indicator (RI), etc. Although UCI is usually transmitted on the PUCCH, it can be transmitted on the PUSCH when control information and service data need to be transmitted simultaneously. Additionally, UCI can be transmitted aperiodically via the PUSCH according to network requests / commands.

[0075] Figure 2 The radio frame structure is shown. In NR, uplink and downlink transmissions are configured in frames. Each radio frame is 10ms long and is divided into two 5ms half-frames (HF). Each half-frame is further divided into five 1ms subframes (SF). Subframes are divided into one or more time slots, and the number of time slots in a subframe depends on the subcarrier spacing (SCS). Depending on the cyclic prefix (CP), each time slot includes 12 or 14 orthogonal frequency division multiplexing (OFDM) symbols. When using a normal CP, each time slot includes 14 OFDM symbols. When using an extended CP, each time slot includes 12 OFDM symbols.

[0076] Table 1 illustrates, for example, how the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS when using normal CP.

[0077] [Table 1]

[0078] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 15kHz (u=0) 14 10 1 30kHz (u=1) 14 20 2 60kHz (u=2) 14 40 4 120kHz (u=3) 14 80 8 240kHz (u=4) 14 160 16

[0079] *N slot symb Number of symbols in a time slot

[0080] *N frame,u slot Number of time slots in a frame

[0081] *N subframe,u slot Number of time slots in a subframe

[0082] Table 2 shows the number of symbols per slot, the number of slots per frame, and the number of slots per subframe that vary according to SCS when using extended CP.

[0083] [Table 2]

[0084] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 60kHz (u=2) 12 40 4

[0085] The frame structure is only an example. The number of subframes, time slots, and symbols in a frame can vary.

[0086] In NR systems, OFDM parameter sets (e.g., SCS) can be configured differently for multiple cells aggregated for a single UE. Therefore, the (absolute time) duration of time resources (e.g., SF, time slots, or TTI) (referred to as time units (TU) for simplicity) consisting of the same number of symbols can be configured differently among the aggregated cells. Here, symbols can include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or Discrete Fourier Transform-Extended-OFDM (DFT-s-OFDM) symbols).

[0087] Figure 3 The resource grid shows a time slot. A time slot comprises multiple symbols in the time domain. For example, when using a normal CP, a time slot comprises 14 symbols. However, when using an extended CP, a time slot comprises 12 symbols. A carrier comprises multiple subcarriers in the frequency domain. A resource block (RB) is defined as multiple consecutive subcarriers in the frequency domain (e.g., 12 consecutive subcarriers). A bandwidth portion (BWP) can be defined as multiple consecutive physical RBs (PRBs) in the frequency domain and corresponds to a single set of parameters (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., five) BWPs. Data communication can be performed through enabled BWPs, and only one BWP can be enabled for a UE. In the resource grid, individual elements are called resource elements (REs), and a complex symbol can be mapped to individual REs.

[0088] Figure 4 This illustrates an example of mapping physical channels within a time slot. In an NR system, a frame is characterized by a self-contained structure consisting of a DL control channel, DL or UL data, and a UL channel, all of which can be included within a single time slot. For example, the first N symbols of a time slot can be used to carry a DL channel (e.g., PDCCH) (hereinafter referred to as the DL control region), and the last M symbols of the time slot can be used to carry a UL channel (e.g., PUCCH) (hereinafter referred to as the UL control region). Each of N and M is an integer equal to or greater than 0. The resource region between the DL control region and the UL control region (hereinafter referred to as the data region) can be used to transmit DL data (e.g., PDSCH) or UL data (e.g., PUSCH). The guard period (GP) provides a time gap for switching from transmit mode to receive mode or from receive mode to transmit mode. Some symbols in a subframe during a DL-to-UL handover can be configured as GP.

[0089] The PDCCH transmits DCI. For example, the PDCCH (i.e., DCI) may carry information about the transmission format and resource allocation of the DL-SCH, resource allocation information for the Uplink Shared Channel (UL-SCH), paging information for the PCH, system information for the DL-SCH, resource allocation information for higher-layer control messages (e.g., RARs transmitted on the PDCCH), transmission power control commands, and information about enabling / releasing configured schedules. The DCI includes Cyclic Redundancy Check (CRC). The CRC is masked using various identifiers (IDs) (e.g., Radio Network Temporary Identifiers (RNTIs)) depending on the owner or purpose of the PDCCH. For example, if the PDCCH is used for a specific UE, the CRC is masked using the UE ID (e.g., Cell-RNTI (C-RNTI)). If the PDCCH is used for paging messages, the CRC is masked using the Paging-RNTI (P-RNTI). If the PDCCH is used for system information (e.g., System Information Block (SIB)), the CRC is masked using the System Information RNTI (SI-RNTI). When the PDCCH is used for RAR, the CRC is masked using the Random Access-RNTI (RA-RNTI).

[0090] Figure 5 An exemplary PDCCH send / receive process is shown.

[0091] Reference Figure 5The BS can send control resource set (CORESET) configuration to the UE (S502). A CORESET is defined as a set of resource element groups (REGs) with a given set of parameters (e.g., subcarrier spacing (SCS), cyclic prefix (CP) length, etc.). Each REG is defined as an OFDM symbol by a (physical) resource block (P)RB. Multiple CORESETs for a UE can overlap in the time / frequency domain. A CORESET can be configured by system information (e.g., master information block (MIB)) or higher-layer signaling (e.g., radio resource control (RRC) signaling). For example, configuration information about a specific common CORESET (e.g., CORESET#0) can be sent in the MIB. For example, the PDSCH carrying system information block 1 (SIB1) can be scheduled by a specific PDCCH, and CORESET#0 can be used to send the specific PDCCH. Furthermore, configuration information about CORESET#N (e.g., N>0) can be sent via RRC signaling (e.g., cell common RRC signaling, UE-specific RRC signaling, etc.). For example, UE-specific RRC signaling carrying CORESET configuration information may include (but is not limited to) various types of signaling, such as RRC establishment messages, RRC reconfiguration messages, and / or BWP configuration information. Specifically, CORESET configuration may include the following information / fields.

[0092] -controlResourceSetId: Indicates the ID of CORESET.

[0093] -frequencyDomainResources: Indicates the frequency domain resources of CORESET. Resources are indicated by a bitmap corresponding to each bit and RB group (= 6 (contiguous) RBs). For example, the most significant bit (MSB) of the bitmap corresponds to the first RB group in BWP. The RB group corresponding to the bit with a value of 1 is allocated as the frequency domain resources of CORESET.

[0094] -duration: Indicates the time-domain resources of the CORESET. It indicates the number of consecutive OFDM symbols included in the CORESET. The duration has a value between 1 and 3.

[0095] -cce-REG-MappingType: Indicates the mapping type from Control Channel Elements (CCEs) to REGs. Interleaved and non-interleaved types are supported.

[0096] -interleaverSize: Indicates the interleaver size.

[0097] -pdcch-DMRS-ScramblingID: Indicates the value used for PDCCH DMRS initialization. When pdcch-DMRS-ScramblingID is not included, the physical cell ID of the serving cell is used.

[0098] -precoderGranularity: Indicates the precoder granularity in the frequency domain.

[0099] -reg-BundleSize: Indicates the REG bundle size.

[0100] -tci-PresentInDCI: Indicates whether the Transport Configuration Index (TCI) field is included in the DL-related DCI.

[0101] -tci-StatesPDCCH-ToAddList: Indicates a subset of TCI states configured in pdcch-Config that are used to provide quasi-colocation (QCL) relationships between DL RS and PDCCH DMRS ports in the RS set (TCI states).

[0102] In addition, the BS can send PDCCH search space (SS) configuration to the UE (S504). The PDCCH SS configuration can be sent via higher-layer signaling (e.g., RRC signaling). For example, RRC signaling may include (but is not limited to) various types of signaling, such as RRC establishment messages, RRC reconfiguration messages, and / or BWP configuration information. Although for the sake of description, Figure 5 The CORESET configuration and PDCCH SS configuration are shown as being signaled separately, but this disclosure is not limited thereto. For example, the CORESET configuration and PDCCH SS configuration may be sent in a single message (e.g., via an RRC signaling) or separately in different messages.

[0103] The PDCCH SS configuration may include information about the configuration of the PDCCH SS set. A PDCCH SS set can be defined as a set of PDCCH candidates monitored by the UE (e.g., blind detection). One or more SS sets can be configured for the UE. Each SS set can be a UE-specific search space (USS) set or a common search space (CSS) set. For convenience, the PDCCH SS set may be referred to as "SS" or "PDCCH SS".

[0104] The PDCCH SS set includes PDCCH candidates. PDCCH candidates are the CCEs that the UE monitors to receive / detect PDCCHs. Monitoring includes blind decoding (BD) of the PDCCH candidates. A PDCCH (candidate) includes 1, 2, 4, 8, or 16 CCEs depending on the aggregation level (AL). A CCE includes 6 REGs. Each CORESET configuration is associated with one or more SSs, and each SS is associated with a CORESET configuration. An SS is defined based on an SS configuration, and the SS configuration may include the following information / fields.

[0105] -searchSpaceId: Indicates the ID of the SS.

[0106] -controlResourceSetId: Indicates the CORESET associated with SS.

[0107] -monitoringSlotPeriodicityAndOffset: Indicates the periodicity (in slots) and offset (in slots) of the PDCCH monitoring.

[0108] -monitoringSymbolsWithinSlot: Indicates the first OFDM symbol used for PDCCH monitoring in the slot configured for PDCCH monitoring. The first OFDM symbol used for PDCCH monitoring is indicated by a bitmap of individual bits corresponding to OFDM symbols in the slot. The MSB of the bitmap corresponds to the first OFDM symbol in the slot. The OFDM symbol corresponding to the bit set to 1 corresponds to the first symbol of the CORESET in the slot.

[0109] -nrofCandidates: Indicates the number of PDCCH candidates for each AL (one of the values ​​0, 1, 2, 3, 4, 5, 6, and 8), where AL = {1, 2, 4, 8, 16}.

[0110] -searchSpaceType: Indicates the DCI format used in CSS or USS and the corresponding SS type.

[0111] Subsequently, the BS can generate a PDCCH and send it to the UE (S506), and the UE can monitor PDCCH candidates in one or more SSs to receive / detect the PDCCH (S508). The timing when the UE monitors the PDCCH candidates (e.g., time / frequency resources) is defined as the PDCCH (monitoring) timing. One or more PDCCH (monitoring) timings can be configured in a time slot.

[0112] Table 3 shows the characteristics of each SS.

[0113] [Table 3]

[0114]

[0115] Table 4 shows the DCI format transmitted on the PDCCH.

[0116] [Table 4]

[0117]

[0118]

[0119] DCI format 0_0 can be used to schedule PUSCH based on TB (or TB level), and DCI format 0_1 ​​can be used to schedule PUSCH based on TB (or TB level) or PUSCH based on code block group (CBG) (or CBG level). DCI format 1_0 can be used to schedule PDSCH based on TB (or TB level), and DCI format 1_1 can be used to schedule PDSCH based on TB (or TB level) or PDSCH based on CBG (or CBG level) (or DL-licensed DCI). DCI formats 0_0 / 0_1 can be referred to as UL-licensed DCI or UL scheduling information, and DCI formats 1_0 / 1_1 can be referred to as DL-licensed DCI or DL ​​scheduling information. DCI format 2_0 is used to transmit dynamic slot format information (e.g., dynamic slot format indicator (SFI)) to the UE, and DCI format 2_1 is used to transmit DL preemption information to the UE. DCI formats 2_0 and / or DCI format 2_1 can be transmitted to the corresponding group of UEs on the group common PDCCH (PDCCH pointing to a group of UEs).

[0120] DCI formats 0_0 and 1_0 can be referred to as fallback DCI formats, while DCI formats 0_1 and 1_1 can be referred to as non-fallback DCI formats. In fallback DCI formats, the DCI size / field configuration remains the same regardless of the UE configuration. Conversely, in non-fallback DCI formats, the DCI size / field configuration varies depending on the UE configuration.

[0121] The CCE to REG mapping type is configured as either an interleaved CCE to REG type or a non-interleaved CCE to REG type.

[0122] - Non-interleaved CCE to REG mapping (or local CCE to REG mapping) Figure 6 ): The 6 REGs used for a given CCE are grouped into a REG bundle, and all REGs used for a given CCE are adjacent. One REG bundle corresponds to one CCE.

[0123] - Interleaved CCE to REG mapping (or distributed CCE to REG mapping) Figure 7): Two, three, or six REGs for a given CCE are grouped into a REG bundle, and the REG bundles are interleaved within the CORESET. In a CORESET containing one or two OFDM symbols, the REG bundle consists of two or six REGs, and in a CORESET containing three OFDM symbols, the REG bundle consists of three or six REGs. The REG bundle size is set based on the CORESET.

[0124] paging

[0125] The network can (i) access UEs in the RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states via paging messages, and (ii) notify UEs in the RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states of system information changes and Earthquake and Tsunami Warning System / Commercial Mobile Alarm System (ETWS / CMAS) notifications via short messages. Both paging messages and short messages are transmitted on a P-RNTI-based PDCCH. Paging messages are transmitted on a logical channel (Paging Control Channel (PCCH)), while short messages are transmitted directly on the physical channel PDCCH. Because the logical channel PCCH is mapped to the physical channel PDSCH, paging messages can be understood as being scheduled on a P-RNTI-based PDCCH basis.

[0126] While the UE remains in the RRC_IDLE state, the UE monitors the paging channel and initiates paging through the core network (CN). In the RRC_INACTIVE state, the UE also monitors the paging channel and initiates paging through the radio access network (RAN). The UE does not need to continuously monitor the paging channel. Discontinuous paging reception (DRX) is defined as the UE in either the RRC_IDLE or RRC_INACTIVE state monitoring the paging channel only during one paging opportunity (PO) per DRX cycle. The paging DRX cycle is configured by the network as follows.

[0127] 1) When CN initiates paging, broadcast the default loop in the system information.

[0128] 2) When paging is initiated by CN, configure a specific loop for UE via NAS signaling.

[0129] 3) When the RAN initiates signaling, configure a UE-specific cycle via RRC signaling.

[0130] Because all POs used for CN-initiated signaling and RAN-initiated signaling of a UE are based on the same UE ID, the two POs overlap. The number of POs in the DRX cycle can be set through system information, and the network can assign UEs to POs based on their IDs.

[0131] When the UE is in the RRC_CONNECTED state, the UE monitors the paging channel SI change indication and PWS notification in each PO notified by system information signaling. In Bandwidth Adaptation (BA), the RRC_CONNECTED UE only monitors the paging channel in the active BWP where the configured CSS is located.

[0132] In shared spectrum channel access, additional PDCCH monitoring opportunities can be configured in the UE's PO for paging monitoring. However, when the UE detects a P-RNTI-based PDCCH transmission in its PO, the UE does not need to monitor subsequent PDCCH monitoring opportunities in the PO.

[0133] To reduce power consumption, the UE can use DRX in RRC_IDLE and RRC_INACTIVE states. The UE monitors one PO per DRX cycle. A PO is a collection of PDCCH monitoring opportunities and may include multiple time slots (e.g., subframes or OFDM symbols) that can transmit paging DCI. A paging frame (PF) is a radio frame and may include one or more POs or the start of one or more POs.

[0134] In multi-beam operation, the UE assumes that the same paging message and the same short message are repeated in all transmission beams. The paging message is identical for both RAN-initiated and CN-initiated paging.

[0135] Upon receiving a paging request from the RAN, the UE initiates an RRC connection restoration procedure. When receiving a paging request from the CN while in the RRC_INACTIVE state, the UE transitions to the RRC_IDL state and notifies the NAS of the CN's paging request.

[0136] The PF and PO used for paging are determined as follows:

[0137] -PF's SFN is determined by the following formula:

[0138] (SFN+PF_offset)mod T=(T div N)*(UE_ID mod N)

[0139] - The index i_s that indicates the index of PO is determined by the following formula:

[0140] i_s = floor(UE_ID / N) mod Ns

[0141] The following parameters can be used to calculate PF and i_s above.

[0142] -T: UE's DRX cycle (T is determined by the minimum of the UE-specific DRX value (if configured by RRC and / or upper layers) and the default DRX value broadcast in the system information. In RRC_IDLE state, if the UE-specific DRX is not configured by the upper layer, the default value is applied).

[0143] -N: Total number of paging frames in T

[0144] -Ns: Number of POs in PF

[0145] -PF_offset: The offset used to determine PF.

[0146] -UE_ID: 5G-S-TMSI mod 1024

[0147] WUS (Wake-up Signal) / PEI (Paging Advance Indication)

[0148] In LTE Rel-15 NB-IoT and MTC, a Wake-up Signal (WUS) is introduced to save UE power. A WUS is a signal that pre-indicates the presence of an actual paging transmission in a paging service block (SS) at a specific location. When the service block (BS) wants to send a paging signal in a point of origin (PO) at a specific location, the BS can send a WUS at the WUS transmission location associated with the PO. The UE monitors the WUS transmission locations associated with the PO at the specific location. If a WUS at a WUS transmission location is detected, the UE can expect to send a paging signal in the PO; if a WUS at a WUS transmission location is not detected, the UE can not expect a paging signal in the PO. This operation can achieve power saving gains. In LTE Rel-16 NB-IoT and MTC, UE group WUS is introduced to increase the power saving gains of Rel-15 WUS. By using the WUS transmission location and sequence determined based on the UE's UE group ID, UE group WUS can advantageously reduce the probability of unnecessary UE wake-ups. Figure 8 This is a diagram illustrating WUS in an LTE system. (See reference...) Figure 8In MTC and NB-IoT, WUS can be used to reduce power consumption associated with paging monitoring. WUS is a physical layer signal that, based on cell configuration, indicates whether the UE should monitor paging signals (e.g., MPDCCH / NPDCCH scrambled with P-RNTI). For UEs without eDRX (i.e., only DRX configured), WUS can be associated with one PO (N=1). Conversely, for UEs with eDRX, WUS can be associated with one or more POs (N≥1). When WUS is detected, the UE can monitor N POs after associating with WUS. When WUS is not detected, the UE can maintain a sleep mode by skipping PO monitoring until the next WUS monitoring. The UE can receive WUS configuration information from the BS and monitor WUS based on this information. For example, WUS configuration information may include the maximum WUS duration, the number of consecutive POs associated with the WUS, and interval information. The maximum WUS duration can refer to the maximum time period during which WUS can be transmitted, and can be expressed as the ratio of the maximum number of repetitions (e.g., Rmax) associated with the PDCCH (e.g., MPDCCH or NPDCCH). Although the UE can anticipate repeated WUS transmissions within the maximum WUS duration, the actual number of WUS transmissions may be less than the maximum number of WUS transmissions within the maximum WUS duration. For example, the number of WUS repetitions may be smaller for UEs in good coverage. The resources / opportunities during which WUS can be transmitted within the maximum WUS duration are called WUS resources. WUS resources can be defined as multiple consecutive OFDM symbols × multiple consecutive subcarriers. WUS resources can be defined as multiple consecutive OFDM symbols × multiple consecutive subcarriers in a subframe or time slot. For example, WUS resources can be defined as 14 consecutive OFDM symbols × 12 consecutive subcarriers. When WUS is detected, the UE does not monitor WUS until the first PO associated with the WUS. When no WUS is detected during the maximum WUS duration, the UE does not monitor paging signals in the PO associated with the WUS (or the UE remains in sleep mode).

[0149] Even in communication systems such as NR, a new method can be defined for transmitting information about channel B (e.g., paging) via channel / signal A (e.g., PEI consisting of control channels such as DCI, abbreviated as P-DCI). Figure 9This illustrates UE operation based on PEI. The UE can receive configuration information related to channel / signal A (e.g., P-DCI) to perform operations for channel / signal A (e.g., P-DCI) (FC201). For example, the UE can use higher-layer signals (e.g., SIB or RRC signaling) to receive the configuration information. The UE can anticipate and monitor channel / signal A (e.g., P-DCI) based on the configuration information (FC202). For example, the BS can anticipate information including UE group ID information, cell ID information, short message related information, and / or PDSCH scheduling information through channel / signal A (e.g., P-DCI). The UE can also monitor channel / signal A (e.g., P-DCI) generated at locations (e.g., search space) where channel / signal A (e.g., P-DCI) can be transmitted based on the above configuration information. If the UE successfully detects channel / signal A (e.g., P-DCI) during a monitoring operation and is instructed to monitor channel / signal B (FC202), the UE can monitor channel / signal A (e.g., P-DCI) at a location associated with the transmitted channel / signal A (FC203). For example, signal B can be a reference signal (e.g., DMRS, CSI-RS / TRS), and channel B can be a PDCCH used for scheduling paging messages or a PDSCH containing paging messages.

[0150] Reference signal for idle / inactive mode

[0151] The following section presents a method for defining and utilizing reference signals that can be used for tracking / measuring in order to obtain the energy-saving effect of UEs in idle / inactive modes.

[0152] In LTE, synchronization signals (i.e., PSS / SSS) are transmitted at 10ms intervals, and CRS is transmitted in almost all subframes and PRBs. Therefore, these normally open reference signals can be easily utilized when the UE intends to perform time / frequency synchronization, tracking, or measurement.

[0153] In NR, based on Rel-16, the UE can use the SSB for measurement and time / frequency tracking in idle / inactive mode. However, the basic transmission interval of the SSB, including the SSS that can be used for measurement, is 20ms, and there is no normally open reference signal available in NR like the CRS in LTE.

[0154] Therefore, in NR systems, UEs operating in idle / inactive mode may need to be frequently woken up for reference signal reception / measurement, etc. Furthermore, time / frequency tracking performance may be relatively degraded in idle / inactive mode. As a more specific example, when a UE is in idle / inactive mode, it prepares to receive paging as follows: The UE needs synchronization / channel estimation to receive the paging DCI and paging message. In idle / inactive mode, the UE receives and measures multiple SSBs as needed. The basic SSB transmission interval is a relatively long 20ms period. Therefore, when multiple SSB measurements are required, the UE remains awake for an extended period, and SSB detection and measurement consume significant power.

[0155] For PDCCH, channel coding / modulation is robustly performed. Therefore, channel estimation / synchronization at the level of UE-decorable PDCCH does not consume high power and thus has low overhead. However, PDSCH reception requires a higher level of channel estimation and synchronization than PDCCH. Therefore, monitoring only PDCCH such as paging DCI does not consume high power, but it may take a significant amount of power and time to prepare channel estimation (e.g., SSB-based estimation) to receive PDSCH scheduled by paging DCI (in the case of PDSCH scheduling for UE).

[0156] As a solution to this problem, it is proposed that idle / inactive UEs measure / use reference signals (in addition to or instead of SSB measurements) while maintaining idle / inactive mode.

[0157] According to the current Rel-16 NR, CSI-RS can be used for CSI estimation, beam management, time-frequency tracking (e.g., TRS), etc. TRS can be configured to support delay spread and Doppler spread estimation while improving time / frequency tracking performance. CSI-RS / TRS configuration is information configured via RRC signaling in connected mode, and CSI-RS / TRS transmission is not expected in the idle / inactive modes of the current NR system.

[0158] A method is proposed to improve UE performance for measurement and time / frequency tracking in idle / inactive modes by utilizing specific reference signals (e.g., CSI-RS / TRS). Additionally, a method is proposed for the BS to notify the UE of configuration information regarding CSI-RS / TRS for idle / inactive modes, and a method for enabling / activating / triggering or disabling / deactivating CSI-RS / TRS transmission is also proposed.

[0159] As an example, a UE in idle / inactive mode may utilize reference signals from communication systems such as LTE and NR. In this case, a particular reference signal may have a structure such as the Channel State Information-Reference Signal (CSI-RS) or Tracking Reference Signal (TRS) as defined in NR. In this disclosure, these particular reference signals are collectively referred to as CSI-RS / TRS without distinguishing them individually. Depending on the context, CSI-RS / TRS may refer to only one of CSI-RS and TRS, or to both applied together. The methods proposed in this disclosure can be applied not only to CSI-RS and TRS, but also to reference signals that can be used for measurement, channel estimation, and time / frequency tracking in idle / inactive mode.

[0160] For example, CSI-RS in idle / inactive mode can also be defined as zero-power (ZP) and non-zero-power (NZP) CSI-RS. Table 5 shows the sequence r(m) of the reference signal defined in NR TS38.211. For example, the sequence r(m) in Table 5 can be used for CSI-RS in idle / inactive mode.

[0161] [Table 5]

[0162]

[0163] Table 6 shows the “CSI-RS-ResourceMapping” information element (IE) related to the CSI-RS RRC connection mode defined in NR TS38.331. The CSI-RS-ResourceMapping IE in Table 6 can be used to configure the RE mapping of CSI-RS in the time domain / frequency domain.

[0164] [Table 6]

[0165]

[0166]

[0167] Figure 10 This is a flowchart illustrating the operation of a BS to which the methods proposed in this disclosure can be applied.

[0168] Reference Figure 10 The BS can generate CSI-RS / TRS related configuration information to support CSI-RS / TRS operation and send it (A01). For example, the configuration information can be sent via higher-layer signals (e.g., SIB or RRC signaling).

[0169] The BS may send information indicating the transmission of CSI-RS / TRS (e.g., an indication of CSI-RS / TRS availability in idle / inactive mode) (A02). For example, it may send information indicating the start of CSI-RS / TRS transmission based on CSI-RS / TRS-related configuration information. The information indicating the start of CSI-RS / TRS transmission may be sent via one or a combination of at least some of MAC CE, RRC, and DCI. For example, the information indicating the transmission of CSI-RS / TRS may include detailed information about the actual transmission of CSI-RS / TRS (e.g., at least a portion of “CSI-RS-ResourceMapping” in Table 6).

[0170] After sending the information instructing the transmission of CSI-RS / TRS, the BS can generate / transmit CSI-RS / TRS based on the relevant CSI-RS / TRS configuration information (A03). When the information instructing the transmission of CSI-RS / TRS (A02) also includes detailed information about the actual transmission of CSI-RS / TRS, the BS can further consider this detailed information when generating and transmitting CSI-RS / TRS.

[0171] The BS can send a message indicating the termination of CSI-RS / TRS transmission to end the CSI-RS / TRS transmission (A04). This operation can be skipped if there is a predetermined termination time for the CSI-RS / TRS transmission.

[0172] Figure 11 Examples of proposed UE operations that can be applied are shown.

[0173] Reference Figure 11 The UE can receive CSI-RS / TRS related configuration information (B01). As an example, the UE can receive CSI-RS / TRS related configuration information via higher-layer signals (e.g., SIB or RRC signaling).

[0174] The UE can detect / receive information indicating the transmission of CSI-RS / TRS by monitoring a specific channel (B02). As described above, the information indicating the transmission of CSI-RS / TRS can indicate the start of CSI-RS / TRS transmission based on CSI-RS / TRS-related configuration information. The information indicating the start of CSI-RS / TRS transmission can be transmitted via one or a combination of at least some of MAC CE, RRC, and DCI. For example, the information indicating the transmission of CSI-RS / TRS may include detailed information about the actual transmission of CSI-RS / TRS (e.g., at least a portion of “CSI-RS-ResourceMapping” in Table 6).

[0175] After sending the information indicating the transmission of CSI-RS / TRS, the BS can perform CSI-RS / TRS reception based on the CSI-RS / TRS related configuration information (B03). When the information indicating the transmission of CSI-RS / TRS (B02) also includes detailed information about the actual transmission of CSI-RS / TRS, the UE can further consider this detailed information to receive CSI-RS / TRS.

[0176] If the UE fails to obtain information indicating the transmission of CSI-RS / TRS, it can perform monitoring again to obtain such information (B02).

[0177] The UE can anticipate and monitor information indicating the termination of CSI-RS / TRS transmission (B04). When the UE receives information indicating the termination of CSI-RS / TRS transmission, it can no longer anticipate receiving CSI-RS / TRS. In this case, it can perform monitoring again to obtain information indicating the transmission of CSI-RS / TRS. If the UE fails to receive information indicating the termination of CSI-RS / TRS transmission, the UE can continue to anticipate receiving CSI-RS / TRS.

[0178] When a predetermined termination time for CSI-RS / TRS transmission exists, the operation of receiving information indicating the termination of CSI-RS / TRS transmission can be skipped.

[0179] For the methods proposed in this disclosure, some of the following methods may be selected and applied. These methods may operate independently without being combined individually, or they may be operated in a manner that combines and connects one or more methods. Some terms, symbols, orders, etc. used in the description of this disclosure may be replaced with other terms, symbols, orders, etc., as long as the principles of this disclosure are maintained.

[0180] In the following description, to illustrate the principles of this disclosure, arbitrary configurations utilizing CSI-RS / TRS in idle / inactive modes are shown and described as examples. However, it should be noted that, unless otherwise stated, the proposed method does not specifically limit the operating mode of the UE or the type of reference signal. Therefore, it is apparent that the method proposed in this disclosure can be applied to all transmit / receive modes and reference signal types of the UE, even without separate description, provided that the principles of the invention are not departed from.

[0181] The following examples of this disclosure are based on NR systems to illustrate the principles of this disclosure; however, unless otherwise stated, the proposed methods are not intended to specify or limit the transmission and reception types of NR. Therefore, it is apparent that the proposed methods are applicable to all wireless communication transmission and reception architectures unless they contradict the principles of this disclosure.

[0182] (Proposal 1)

[0183] Proposal 1 proposes a method for periodically configuring CSI-RS / TRS (resources) for the UE in idle / inactive mode. In this case, the periodic CSI-RS / TRS configuration can be transmitted via RRC information sent by the BS, and may include information about periodicity and slot offset. As described later, the SIBx broadcast by the BS can also be understood as an example of RRC information.

[0184] For example, after configuring CSI-RS / TRS for a UE in idle / inactive mode via RRC, the BS can transmit CSI-RS / TRS from a predetermined time (e.g., a predetermined start position between the UE and the BS) based on periodicity and slot offset. When the UE determines that the CSI-RS / TRS of the UE in idle / inactive mode will be transmitted via RRC information and checks the periodicity and slot offset information of the transmission, it can anticipate / assume the CSI-RS / TRS from the predetermined start position based on the periodicity and slot offset.

[0185] Configure / reconfigure via RRC (or SIB) CSI-RS / TRS

[0186] For example, in Proposal 1, the RRC information can be information acquired by the UE in connected mode. Even after switching from connected mode to idle / inactive mode, the UE can at least maintain the CSI-RS / TRS configuration without releasing (or discarding) it. Thus, at least a portion of the CSI-RS / TRS configuration acquired in connected mode can be reused in idle / inactive mode. In this case, no separate overhead is incurred in signaling the idle / inactive mode CSI-RS / TRS configuration, or signaling overhead can be minimized. Furthermore, from the network's perspective, the CSI-RS / TRS that can be used in connected mode is operable for the UE in idle / inactive mode, thus reducing the overhead of reference signals. For example, from the network's perspective, at least a portion of the connected mode CSI-RS / TRS can be reused as at least a portion of the idle / inactive mode CSI-RS / TRS.

[0187] Alternatively, in Proposal 1, at least a portion of the RRC information can be configured using higher-layer signaling (e.g., SIB) that the UE can obtain even in idle / inactive mode. In this case, the UE can obtain CSI-RS / TRS information even when not in connected mode within the cell. Furthermore, when the BS intends to change the transmission periodicity or pattern of the CSI-RS / TRS, the UE in idle / inactive mode can also be allowed to obtain information regarding the changed transmission periodicity or pattern of the CSI-RS / TRS.

[0188] As an example, when the BS intends to provide configuration / reconfiguration information regarding the periodic CSI-RS / TRS transmissions of the UE in idle / inactive mode, it can use the systemInfoModification bit included in the paging short message to indicate changes to the SIB (e.g., a short message included in the paging DCI or a short message included in the PEI, as presented below). When the periodic CSI-RS / TRS configuration for idle / inactive mode is provided via the SIB, a change in the periodic CSI-RS / TRS configuration corresponds to a change in a portion of the SIB; therefore, the BS can notify of the SIB change resulting from the change in the periodic CSI-RS / TRS configuration for idle / inactive mode via the short message field in the DCI / PEI. The BS can provide information related to CSI-RS / TRS (or scheduling information about the SIB including this information) via SIB1 after sending the short message.

[0189] From the UE's perspective, the UE can obtain the DCI scrambled with P-RNTI through CSS monitoring. When the UE determines that the systemInfoModification bit in the short message field is set to 1, it can check SIB1 and obtain CSI-RS / TRS related information (or scheduling information for the SIB that includes this information).

[0190] For example, when a UE determines that it needs to configure / reconfigure CSI-RS / TRS, it can request this from the BS via the RACH procedure, and then obtain CSI-RS / TRS related information based on the information configured by the BS. When the BS receives information requested by a specific UE, it can provide the UE with scheduling information for obtaining CSI-RS / TRS and provide the relevant information through scheduled resources.

[0191] For example, when information about CSI-RS / TRS used by the UE in idle / inactive mode is provided only through the SIB (e.g., information about CSI-RS / TRS received by the UE in connected mode is not reused or provided in idle / inactive mode), the BS may specifically indicate the location of time resources (e.g., time slots) for transmitting CSI-RS / TRS. Parameters indicating the location of time slots may include values ​​for periodicity and time slot offset, or may indicate the offset value of the PO monitored by a specific UE group (or the location of PDSCH transmissions that are the same as or scheduled by the PO).

[0192] The start / end of CSI-RS / TRS transmission is indicated based on RRC (or SIB).

[0193] As an example, a method is proposed to indicate the start and termination of periodic CSI-RS / TRS transmissions of a UE in idle / inactive mode via RRC (or SIB). When a BS intends to start a new periodic CSI-RS / TRS transmission for a UE in idle / inactive mode, it can indicate this via RRC (or SIB).

[0194] The termination of periodic CSI-RS / TRS transmissions can also be determined by the BS. In this case, the BS can use the SIB to transmit information about the termination of periodic CSI-RS / TRS. The UE can obtain information about the termination of periodic CSI-RS / TRS through the SIB.

[0195] The UE can determine the expected start (or end) time of CSI-RS / TRS transmission based on information related to the start / end of periodic CSI-RS / TRS.

[0196] As a specific method for the BS to notify the UE of the start / end time of the periodic CSI-RS / TRS of the UE in idle / inactive mode and for the UE to obtain from the BS the start / end time of the interval at which the UE can expect to receive periodic CSI-RS / TRS, the method of using paging and RACH described in the CSI-RS / TRS information configuration / reconfiguration method using RRC (or SIB) can be applied.

[0197] According to Proposal 1, under the condition that stable transmission of CSI-RS / TRS is allowed for a long time, the overhead of the BS can be reduced by reducing the separate configuration for enabling / disabling CSI-RS / TRS, and the operation of the UE to obtain information related to CSI-RS / TRS can be simplified.

[0198] (Proposal 2)

[0199] Proposal 2 proposes a method for semi-persistently configuring CSI-RS / TRS (resources) for UEs in idle / inactive mode.

[0200] The semi-persistent CSI-RS / TRS according to Proposal 2 can also correspond to an example of periodic resource allocation / transmission. According to Proposal 2, the start of CSI-RS / TRS transmission (or the availability of CSI-RS / TRS resources) can be indicated by separate MAC (L2) or PHY (L1) signaling after CSI-RS / TRS configuration.

[0201] The BS can transmit the configuration of CSI-RS / TRS for idle / inactive mode via higher-layer signaling (e.g., RRC). The CSI-RS / TRS configuration may include information about the periodicity and slot offset of the CSI-RS / TRS. The SIBx broadcast by the BS can also be understood as an example of RRC information. After the BS signals the CSI-RS / TRS configuration for the UE in idle / inactive mode via higher-layer signaling (e.g., RRC), it can send trigger information to the UE indicating CSI-RS / TRS transmission (e.g., information indicating that CSI-RS / TRS can be received in idle / inactive mode using the CSI-RS / TRS configuration). Thereafter, the BS can transmit CSI-RS / TRS from a specific time (e.g., a predetermined time after sending the trigger information or from a predetermined start position) according to the periodicity and slot offset. The UE can determine, via the RRC information, that CSI-RS / TRS transmission (or configuration of corresponding resources) can be supported for the UE in idle / inactive mode, and then obtain the trigger information indicating the start of CSI-RS / TRS transmission. Subsequently, the UE can anticipate / assume CSI-RS / TRS transmission based on periodicity and time slot offset (from a predetermined start position).

[0202] Configure / reconfigure via RRC (or SIB) CSI-RS / TRS

[0203] For example, in Proposal 2, as in Proposal 1, RRC information can be obtained by the UE in connected mode. Even after switching from connected mode to idle / inactive mode, the UE can at least maintain the CSI-RS / TRS configuration without releasing (or discarding) it. Thus, at least a portion of the CSI-RS / TRS configuration obtained in connected mode can be reused in idle / inactive mode. In this case, there is no separate overhead in signaling the idle / inactive mode CSI-RS / TRS configuration, or the signaling overhead can be minimized. Furthermore, from the network's perspective, the UE can operate the CSI-RS / TRS that can be used in connected mode in idle / inactive mode, thus reducing the overhead of reference signals. For example, from the network's perspective, at least a portion of the connected mode CSI-RS / TRS can be reused as at least a portion of the idle / inactive mode CSI-RS / TRS.

[0204] For example, in Proposal 2, as in Proposal 1, at least a portion of the RRC information can be configured using higher-layer signaling (e.g., SIB) that the UE can obtain even in idle / inactive mode. In this case, the UE can obtain CSI-RS / TRS information even if it is not in connected mode within the cell. Furthermore, when the BS intends to change the transmission periodicity or pattern of the CSI-RS / TRS, the UE in idle / inactive mode can be allowed to obtain information about the changed transmission periodicity or pattern of the CSI-RS / TRS.

[0205] As an example, when the BS intends to provide configuration / reconfiguration information regarding the periodic CSI-RS / TRS transmissions of the UE in idle / inactive mode, it can use the systemInfoModification bit included in the paging short message (e.g., a short message included in the paging DCI or a short message included in the PEI, as presented below) to indicate the change of the SIB. When the periodic CSI-RS / TRS configuration for idle / inactive mode is provided via the SIB, a change in the periodic CSI-RS / TRS configuration for idle / inactive mode corresponds to a change in a portion of the SIB. Therefore, the BS can notify the change of the SIB caused by the change in the periodic CSI-RS / TRS configuration for idle / inactive mode via the short message field in the DCI / PEI. The BS can provide information related to CSI-RS / TRS (or scheduling information about the SIB that includes this information) via SIB1 after sending the short message.

[0206] From the UE's perspective, the UE can obtain the DCI scrambled with P-RNTI through CSS monitoring. When the UE determines that the systemInfoModification bit in the short message field is set to 1, it can check SIB1 and obtain CSI-RS / TRS related information (or scheduling information for the SIB that includes this information).

[0207] For example, when a UE determines that it needs to configure / reconfigure CSI-RS / TRS, it can request this from the BS via the RACH procedure, and then obtain CSI-RS / TRS related information based on the information configured by the BS. When the BS receives information requested by a specific UE, it can provide the UE with scheduling information for obtaining CSI-RS / TRS and provide the relevant information through scheduled resources.

[0208] For example, when information about CSI-RS / TRS used by the UE in idle / inactive mode is provided only through the SIB (e.g., information about CSI-RS / TRS received by the UE in connected mode is not reused or provided in idle / inactive mode), the BS may specifically indicate the location of time resources (e.g., time slots) for transmitting CSI-RS / TRS. Parameters indicating the location of time slots may include values ​​for periodicity and time slot offset, or may indicate the offset value of the PO monitored by a specific UE group (or the location of PDSCH transmissions that are the same as or scheduled by the PO).

[0209] CSI-RS / TRS transmission start / stop indication

[0210] A method for enabling / disabling idle / inactive CSI-RS / TRS via RRC (or SIB) is proposed.

[0211] (Proposal 2-1) Enabling / Disabling based on MAC CE

[0212] Proposal 2-1 proposes using a MAC control element (CE) to enable / disable semi-persistent CSI-RS / TRS for UEs in idle / inactive modes configured via RRC (or SIB). In this configuration, the BS can instruct CSI-RS / TRS transmission via the MAC CE before sending the expected CSI-RS / TRS for the UE in idle / inactive mode. In this configuration, the UE receiving the semi-persistent CSI-RS / TRS configured via RRC (or SIB) in idle / inactive mode can determine whether to send the CSI-RS / TRS configured via the MAC CE.

[0213] As a specific example of Proposal 2-1, the UE can be configured to expect to receive a MAC CE via a paging procedure. In this case, the BS can use the paging procedure to inform whether to enable / disable CSI-RS / TRS transmission on semi-persistent CSI-RS / TRS resources pre-configured via RRC. The UE can monitor the paging. When information about enabling / disabling CSI-RS / TRS transmission is obtained from the MAC CE acquired during the paging procedure, the UE can expect to receive semi-persistent CSI-RS / TRS on resources configured via RRC.

[0214] As a specific method of using the paging procedure, enable / disable information regarding semi-persistent CSI-RS / TRS transmission can be included in the PDSCH scheduled via the paging DCI in the form of a MAC CE. In this case, a 1-bit indicator used to determine whether the MAC CE is included in the PDSCH can be included in the DCI scrambled to the P-RNTI. Specifically, the 1-bit indicator can be included in the short message field. In this case, when the UE detects the DCI scrambled by the P-RNTI and determines based on the 1-bit indicator that enable / disable information regarding semi-persistent CSI-RS / TRS can be transmitted via a MAC CE, it can expect to receive the MAC CE on the PDSCH scheduled via the DCI.

[0215] However, when enabling / disabling is performed by sending a MAC CE on the PDSCH scheduled by the paging DCI, as in the proposed method, a conventional UE that does not anticipate semi-persistent CSI-RS / TRS transmissions while monitoring the same paging opportunity (PO) may perform unnecessary PDSCH decoding or misinterpret the transmission of incorrect information. To prevent this problem, the proposed method can be configured to apply only when the short message indicator bit has a value of "10" (i.e., "only short messages exist in the DCI" indicated by the short message indicator based on Rel-16 NR). In this case, assuming the scheduling of PDSCH exists, and a conventional UE can assume, according to the interpretation rules of the short message indicator, that the DCI field related to the scheduling of PDSCH is a reserved bit, then a UE with short message capability for MAC CE can decode the PDSCH including the MAC CE.

[0216] When using the method proposed in Proposal 2-1, the MAC CE, which includes information about the resource set ID of the CSI-RS / TRS, can be included. In this case, the BS can configure multiple resource sets via RRC (or SIB) and can be configured to indicate one (or more) resource set IDs via the MAC CE. The UE can then receive the configuration of multiple resource sets via RRC (or SIB) and identify and apply the actual resource set IDs used via the MAC CE. This operation can be designed to increase network scheduling flexibility by allowing the BS to determine a CSI-RS / TRS transmission pattern suitable for the network environment.

[0217] When using the method proposed in Proposal 2-1, the MAC CE, which includes information on the duration for maintaining CSI-RS / TRS transmissions, can be included in the MAC CE that includes information on enabling / disabling semi-persistent CSI-RS / TRS. This duration can be configured based on the start time of the MAC CE transmission (or the PDCCH used to schedule the MAC CE). The UE can continue to anticipate semi-persistent CSI-RS / TRS transmissions after the transmission time, and can stop anticipating CSI-RS / TRS when the configured duration expires. This configuration is intended to reduce problems that occur when a MAC CE for disabling is lost, and the UE continues to anticipate CSI-RS / TRS after acquiring a MAC CE for enabling. Additionally, when sending a MAC CE for enabling, the BS can be allowed to terminate CSI-RS / TRS transmissions without requiring a separate MAC CE transmission for disabling. Therefore, network overhead savings can be achieved.

[0218] (Proposal 2-2) (via RRC) Enable / disable based on paging messages

[0219] Proposal 2-2 proposes a method for enabling / disabling (semi-persistent) CSI-RS / TRS for a UE in idle / inactive mode configured via RRC (or SIB) using a paging message (PDSCH) at the RRC layer. In this case, the BS can indicate the expected CSI-RS / TRS transmission for the UE in idle / inactive mode via the paging message using RRC signaling before sending the CSI-RS / TRS. In this case, the UE receiving the semi-persistent CSI-RS / TRS configured via RRC (or SIB) in idle / inactive mode can determine whether to send the CSI-RS / TRS configured via the paging message using RRC signaling.

[0220] As a specific example of Proposal 2-2, the UE can receive configuration of the RNTI for CSI-RS / TRS transmission from the BS. When the information identified by the UE ID field (i.e., ue-Identity) in the paging message is the configured RNTI information, the UE can expect CSI-RS / TRS enabling information. In this case, the RNTI information can be configured for the UE via the RRC (or SIB) sent by the BS. Multiple RNTIs for CSI-RS / TRS transmission can be configured in a cell. As an example, each of the multiple RNTIs can be used to individually indicate a respective resource set ID. Alternatively, at least one RNTI can indicate the deactivation of semi-persistent CSI-RS / TRS transmission. In this case, the BS can increase the scheduling flexibility of the semi-persistent CSI-RS / TRS transmission pattern as needed.

[0221] When using the method proposed in Proposal 2-2, the paging message including semi-persistent CSI-RS / TRS enable / disable information may include information about the duration for which CSI-RS / TRS transmission will be maintained. Specifically, this duration can be configured to use a distinguishable RNTI identified by the field of the aforementioned UE ID (i.e., ue-Identity). To this end, the BS can define the duration corresponding to each RNTI used for semi-persistent CSI-RS / TRS and transmit it via RRC (or SIB), and the UE can be configured to acquire and operate upon it. The duration can be configured to start based on the transmission time of the PDSCH (or PDCCH for scheduling the paging message) including the paging message. The UE can continue to anticipate semi-persistent CSI-RS / TRS transmission after the transmission time, and can cease anticipating CSI-RS / TRS when the configured duration has elapsed. This configuration is intended to reduce problems that occur when a paging message for disabling is lost, and the UE continues to anticipate CSI-RS / TRS after acquiring a paging message for enabling. Additionally, when sending a paging message to enable paging, the BS can be allowed to terminate CSI-RS / TRS transmissions without requiring a separate paging transmission for deactivation. This results in a gain in network overhead savings.

[0222] The method proposed in Proposal 2-2 can reduce the transmission / reception overhead of separate configurations such as SIB transmission and acquisition. Therefore, the latency occurring during enable / disable operations can be reduced. Additionally, resource overhead can be reduced on the BS side, and energy savings can be achieved on the UE side. Furthermore, since the paging message format used by legacy UEs is reused, the same PDSCH can be shared with legacy UEs, which is advantageous in terms of coexistence.

[0223] (Proposal 2-3) Enable / disable DCI

[0224] Proposal 2-3 proposes a method for using DCI to enable / disable CSI-RS / TRS for a UE in idle / inactive mode configured via RRC (or SIB). For example, CSI-RS / TRS configuration / transmission / resources configured for the UE can be enabled based on DCI. After enabling, CSI-RS / TRS configuration / transmission / resources can be disabled based on DCI. In this way, the BS can indicate the enable / disable (i.e., availability) of CSI-RS / TRS via DCI before sending the expected CSI-RS / TRS for the UE in idle / inactive mode. The UE can receive the (semi-persistent) CSI-RS / TRS configuration for the UE in idle / inactive mode via RRC (or SIB) and then determine whether to send the configured CSI-RS / TRS based on the received DCI.

[0225] As a specific use case of DCI-based enable / disable according to Proposals 2-3, the PDCCH carrying the DCI indicating enable / disable can have a CRC scrambled with P-RNTI. The UE can obtain enable / disable information about semi-persistent CSI-RS / TRS via the PDCCH carrying the DCI CRC scrambled with P-RNTI. As mentioned above, using P-RNTI to indicate enable / disable DCI does not require the UE to monitor a separate (alternately configured) search space to obtain enable / disable information about semi-persistent CSI-RS / TRS, thus potentially advantageous in terms of UE energy saving. The paging DCI transmitted based on P-RNTI and its search space are already defined, and the UE needs to perform blind detection based on the P-RNTI of the paging DCI within the search space. Therefore, transmitting the DCI indicating enable / disable based on P-RNTI can be advantageous in terms of minimizing the increase in processing burden on the UE and UE energy saving. In addition, since the BS does not need to configure a separate PDCCH transmission to provide enable / disable information, it has advantages in terms of network overhead savings. In addition, resource utilization efficiency can be improved when there is no dedicated search space for indicating enabled / disabled DCI, that is, when the search space used for paging DCI is reused for indicating enabled / disabled DCI transmission and reception.

[0226] As a more specific example of an implementation of using P-RNTI scrambled DCI to indicate enable / disable, the DCI indicating enable / disable may include a short message field.

[0227] As an example, indications regarding the activation / deactivation of CSI-RS / TRS can utilize the short message field included in the DCI. When the BS has no paging message to send, the status of the short message indicator used for sending only short messages (e.g., in Rel-16 NR, short message indicator = "10" means "only short messages exist in the DCI") can even be used to indicate the activation / deactivation of CSI-RS / TRS. When the short message indicator = "10" in Rel-16 NR is reused to indicate the activation / deactivation of CSI-RS / TRS, it prevents legacy UEs such as Rel-16 NR UEs from attempting unnecessary PDSCH detection due to the DCI.

[0228] Additionally, as an example of using the Short Message field, 1 bit in the Short Message field (additional, reserved, or existing 1 bit) can be used to indicate the activation / deactivation of CSI-RS / TRS. When CSI-RS / TRS is activated via this 1 bit, the UE can expect CSI-RS / TRS to be sent periodically / offset until it receives a separate deactivation message after receiving the DCI. When CSI-RS / TRS is deactivated via this 1 bit, the UE can not expect (semi-persistent) CSI-RS / TRS transmission until it receives a separate activation message after receiving the DCI.

[0229] As a more specific example, when a duration pre-configured (or defined by the standard) via RRC (or SIB) exists, the UE anticipates sending CSI-RS / TRS within that duration, starting from the time it receives a 1-bit indication from the short message field. This configuration aims to reduce problems that occur when the UE continues (e.g., semi-permanently) anticipating CSI-RS / TRS after receiving the DCI for enabling, while missing the DCI for disabling. Additionally, when sending the DCI for enabling, the BS can be allowed to terminate the transmission of CSI-RS / TRS without requiring a separate paging DCI transmission for disabling, etc. Therefore, network overhead savings can be achieved.

[0230] As an example of using a short message field to indicate enable / disable, N bits can be used in the short message field, and a total of 2 bits can be used. N Two states are used to indicate whether it is enabled / disabled and the duration. In this case, 2 N -1 state can be configured to express CSI-RS / TRS enabled and express different 2 states. N -1 duration. Additionally, a status can be used to disable CSI-RS / TRS.

[0231] When the duration is dynamically indicated via DCI as described above, more resources can be used in the short message field compared to using a single pre-defined duration, and the scheduling flexibility of the duration can be increased.

[0232] Alternatively, as an example of a short message field used to indicate enable / disable, a total of 2 N The status can be used to indicate enabled / disabled and resource set ID. For example, 2 N -1 state can be configured to express CSI-RS / TRS enable and express different 2 states respectively. N -1 resource set ID. Additionally, a state can be configured for disabling CSI-RS / TRS. Thus, the BS can dynamically control the CSI-RS / TRS transmission pattern to suit network conditions.

[0233] The duration signaling / indication method and resource set ID indication method proposed above can be used in combination (e.g., 2). N Each state can be used simultaneously to express enable / disable, duration, and resource set ID.

[0234] According to Proposal 2, the BS can indicate the activation / deactivation of CSI-RS / TRS with low latency and overhead. Furthermore, according to the implementation, the BS can adjust the CSI-RS / TRS transmission pattern. The UE maintains and applies the acquired CSI-RS / TRS related information once within a specific time period. Therefore, the relevant information acquisition process can be simplified when a reconfiguration of CSI-RS / TRS transmission occurs.

[0235] (Proposal 3)

[0236] Proposal 3 proposes a method for non-periodicly configuring CSI-RS / TRS for a UE in idle / inactive mode. Here, the non-periodic configuration of CSI-RS / TRS can be provided by an RRC sent by the BS, indicating the CSI-RS / TRS transmission allow position. The BS can signal that it will transmit CSI-RS / TRS for the UE in idle / inactive mode via RRC, and then transmit trigger information indicating this to the UE before CSI-RS / TRS transmission. It can then transmit CSI-RS / TRS according to the predetermined transmission allow position. The UE can determine that the CSI-RS / TRS for the UE in idle / inactive mode can be transmitted based on the RRC information, and then obtain the trigger information indicating this before CSI-RS / TRS transmission. Thereafter, it can assume that CSI-RS / TRS can be expected according to the predetermined transmission allow position.

[0237] Configure / reconfigure via RRC (or SIB) CSI-RS / TRS

[0238] In Proposal 3, RRC information can be obtained by the UE in connected mode. Even after switching from connected mode to idle / inactive mode, the UE can at least maintain the CSI-RS / TRS configuration without releasing (or discarding) it. Thus, at least a portion of the CSI-RS / TRS configuration obtained in connected mode can be reused in idle / inactive mode. In this case, no separate overhead is incurred in signaling the idle / inactive mode CSI-RS / TRS configuration, or signaling overhead can be minimized. Furthermore, from the network's perspective, the UE can operate the CSI-RS / TRS that can be used in connected mode in idle / inactive mode, thus reducing the overhead of reference signals. For example, from the network's perspective, at least a portion of the connected mode CSI-RS / TRS can be reused as at least a portion of the idle / inactive mode CSI-RS / TRS.

[0239] At least a portion of the RRC information can be configured using higher-layer signaling (e.g., SIB) that the UE can obtain even in idle / inactive mode. In this case, the UE can obtain CSI-RS / TRS information even if it is not in connected mode within the cell. Furthermore, when the BS intends to change the transmission periodicity or pattern of the CSI-RS / TRS, the UE in idle / inactive mode may be allowed to obtain information about the changed transmission periodicity or pattern of the CSI-RS / TRS.

[0240] As an example, when the BS intends to provide configuration / reconfiguration information regarding the periodic CSI-RS / TRS transmissions of the UE in idle / inactive mode, it can use the systemInfoModification bit included in the paging short message (e.g., a short message included in the paging DCI or a short message included in the PEI, as presented below) to indicate the change of the SIB. When the periodic CSI-RS / TRS configuration for idle / inactive mode is provided via the SIB, a change in the periodic CSI-RS / TRS configuration for idle / inactive mode corresponds to a change in a portion of the SIB. Therefore, the BS can notify the change of the SIB caused by the change in the periodic CSI-RS / TRS configuration for idle / inactive mode via the short message field in the DCI / PEI. The BS can provide information related to CSI-RS / TRS (or scheduling information about the SIB that includes this information) via SIB1 after sending the short message.

[0241] From the UE's perspective, the UE can obtain the DCI scrambled with P-RNTI through CSS monitoring. When the UE determines that the systemInfoModification bit in the short message field is set to 1, it can check SIB1 and obtain CSI-RS / TRS related information (or scheduling information for the SIB that includes this information).

[0242] For example, when a UE determines that it needs to configure / reconfigure CSI-RS / TRS, it can request this from the BS via the RACH procedure, and then obtain CSI-RS / TRS related information based on the information configured by the BS. When the BS receives information requested by a specific UE, it can provide the UE with scheduling information for obtaining CSI-RS / TRS and provide the relevant information through scheduled resources.

[0243] For example, when information about CSI-RS / TRS used by the UE in idle / inactive mode is provided only through the SIB (e.g., information about CSI-RS / TRS received by the UE in connected mode is not reused or provided in idle / inactive mode), the BS may specifically indicate the location of time resources (e.g., time slots) for transmitting CSI-RS / TRS. Parameters indicating the location of time slots may include values ​​for periodicity and time slot offset, or may indicate the offset value of the PO monitored by a specific UE group (or the location of PDSCH transmissions that are the same as or scheduled by the PO).

[0244] Indicate whether to send CSI-RS / TRS

[0245] The method proposed in Proposal 3 includes a DCI method for indicating whether to perform aperiodic CSI-RS / TRS transmissions for UEs in idle / inactive mode. When the BS intends to send a new aperiodic CSI-RS / TRS transmission for a UE in idle / inactive mode, it can indicate this transmission via DCI. In this case, the transmission of aperiodic CSI-RS / TRS can correspond to a transmission timing. The UE can then determine the expected time of the CSI-RS / TRS transmission based on the information in the received DCI.

[0246] As a concrete example of Proposal 3, the UE can obtain information about the transmission time of aperiodic CSI-RS / TRS via the PDCCH of the DCI carrying a CRC scrambled to the P-RNTI. Therefore, the UE does not need to monitor a separate (alternatively configured) search space to obtain information about whether to transmit aperiodic CSI-RS / TRS. This can therefore offer advantages in terms of UE energy efficiency. The paging DCI transmitted based on the P-RNTI and its search space are already defined, and the UE needs to perform blind detection within the search space based on the P-RNTI used for the paging DCI. Therefore, transmitting a DCI based on the P-RNTI indicating whether to perform aperiodic CSI-RS / TRS transmission may be advantageous in minimizing the increased processing burden on the UE and in terms of UE energy efficiency. Furthermore, since the BS does not need to configure a separate PDCCH transmission to provide information about whether to perform a transmission, it offers advantages in terms of network overhead savings. In addition, resource utilization efficiency can be improved when there is no dedicated search space for DCI indicating whether to perform aperiodic CSI-RS / TRS transmission, that is, when the search space used for paging DCI is reused for the transmission and reception of DCI indicating whether to perform aperiodic CSI-RS / TRS transmission.

[0247] When using the method proposed in Proposal 3 and determining whether to transmit an aperiodic CSI-RS / TRS by means of DCI scrambled with a P-RNTI, the transmission time of the aperiodic CSI-RS / TRS can be determined as the relative position with respect to the next PO, PO#n, after the transmission of the aperiodic CSI-RS / TRS is indicated to the UE by the DCI. The relative position can be represented by an offset from PO#n. For example, the BS can transmit the aperiodic CSI-RS / TRS at a time position offset earlier than PO#n. The UE can expect the aperiodic CSI-RS / TRS at a position offset earlier than PO#n. This configuration can be aimed at providing a structure in which the UE can utilize CSI-RS / TRS instead of SSB in the CSS monitoring operation for paging. Additionally, according to this configuration, when the gap (d1 = offset) between the transmission time of the CSI-RS / TRS and PO#n is shorter than the gap (d2) between the SSB (e.g., the last SSB before PO#n) and PO#n (i.e., d1 < d2), the waiting time from when the UE performs (CSI-RS / TRS- or SSB-based) time / frequency tracking until the monitoring of PO# starts can be reduced, and thus an energy-saving gain can be obtained. In a system using WUS (e.g., a PEI signal or channel sent by the BS to the UE to pre-indicate whether CSS for paging needs to be monitored), the transmission position of WUS (corresponding to PO#n, instead of PO#n) can be used as a reference position for determining the transmission of the aperiodic CSI-RS / TRS.

[0248] As a specific method of using DCI scrambled with a P-RNTI when using the method proposed in Proposal 3, the short message field in the DCI can be used. When the BS has no paging message to send, the status of the short message indicator that only sends a short message (e.g., in Rel-16 NR, short message indicator = "10" means "only a short message exists in the DCI") can even be used to indicate the transmission of the CSI-RS / TRS. When the short message indicator in Rel-16 NR = "10" is reused to indicate the transmission of the CSI-RS / TRS, conventional UEs such as Rel-16 NR UEs can be prevented from attempting unnecessary PDSCH detection due to the DCI.

[0249] Additionally, as an example of using the short message field, 1 bit (additional, reserved, or existing 1 bit) in the short message field can be used to indicate the transmission of the CSI-RS / TRS. When the transmission of the CSI-RS / TRS is indicated by this 1 bit, the UE can expect the transmission of the CSI-RS / TRS at the position relative to the next PO after receiving the DCI.

[0250] According to the method proposed in Proposal 3, the BS can dynamically control the transmission of CSI-RS / TRS without reserving resources for it. Therefore, scheduling flexibility is enhanced. Furthermore, since the UE can only anticipate the transmission of CSI-RS / TRS when acquiring DCI, the burden of lost DCI is reduced.

[0251] (Proposal A) Instructions based on WUS(PEI) / Paging DCI

[0252] The examples above have already presented DCI-based CSI-RS / TRS indications (e.g., enable / availability / transmission indications). A more specific example of DCI-based CSI-RS / TRS indications is presented in Proposal A.

[0253] Proposal A proposes a method for configuring / setting information in various signals / channels to provide CSI-RS / TRS information to UEs in idle / inactive mode when WUS and paging DCI are available. The configuration of resource information for CSI-RS / TRS for the UE in the time / frequency / code domain can be signaled via an RRC sent by the BS. This configuration provides the location where CSI-RS / TRS can be transmitted. The BS can signal via RRC that it will transmit CSI-RS / TRS for UEs in idle / inactive mode, and then (before CSI-RS / TRS transmission) send information indicating CSI-RS / TRS transmission to the UE. Afterward, the BS can perform CSI-RS / TRS transmission. For example, CSI-RS / TRS transmission can be performed (between the UE and BS) at a predetermined transmission-allowed location. The UE can determine to configure its CSI-RS / TRS in idle / inactive mode based on the RRC information, and then obtain the information indicating CSI-RS / TRS transmission. Afterward, CSI-RS / TRS can be anticipated / assumed (based on the predetermined transmission-allowed location).

[0254] In Proposal A, when both CSI-RS / TRS and WUS are configured for an idle / inactive mode UE, the UE can expect that information indicating whether to send CSI-RS / TRS (hereinafter, availability indication) will be included in both WUS and paging DCI.

[0255] As an example, WUS and paging DCI may be allowed to include different availability indication information. The methods proposed in this disclosure can also be applied when a common availability indication exists in two different signals / channels. For example, information regarding the availability indication indicated by WUS may include information regarding the availability indication of a configurable CSI-RS / TRS during the duration between the time the UE acquires WUS and the location of the associated PO (i.e., the PO indicating WUS).

[0256] Here, the information regarding availability indication can be limited to the indication of CSI-RS / TRS with the same beam orientation as WUS (e.g., the same SSB index) and a QCL assumption. Specifically, when WUS is configured with DCI and includes 1 bit in the DCI providing information about CSI-RS / TRS indication, the CSI-RS / TRS indicated by this 1 bit can be limited to CSI-RS / TRS resources within the CSI-RS / TRS resources that have the same QCL assumption as WUS, and / or the duration of the indication can be limited to the duration between WUS and PO. In this case, the UE can select or has already selected the SSB beam index to receive during the PEI monitoring step, or only monitor the PO corresponding to the selected SSB beam orientation. Therefore, only the necessary TRS availability indication information expected to be used by the UE is provided to reduce signaling overhead. Information regarding availability indication indicated by WUS may include information indicating a specific CSI-RS / TRS resource (or resource set) and / or information about the time window of the duration between WUS and PO.

[0257] As illustrated in the example above, information regarding the availability indication via paging DCI may include configurable CSI-RS / TRS availability indication information for a specific time period (e.g., one or more DRX cycles or multiple time slots / frames) from the time the paging DCI is obtained from the UE. In this case, information regarding the availability indication can be provided regardless of the beam direction of the PDCCH transmitting the paging DCI (i.e., the QCL assumption of the transmitted and received paging PDCCHs). In a particular approach, when N bits in the paging DCI are used to indicate the availability of CSI-RS / TRS, the CSI-RS / TRS resource corresponding to these N bits can be configured by a higher layer, and / or the duration of the indication can be determined by a standard, or its size can be applied via a higher layer indication (or one of the sizes determined by a standard or indicated by a higher layer can be selected via the paging DCI). When the UE obtains availability information regarding CSI-RS / TRS via paging DCI, it is expected that the obtained information will be applied from the next DRX cycle. In addition, due to the changes in the radio channel environment during the DRX cycle, the beam direction that is favorable to the UE may change and become unpredictable.

[0258] Figure 10 The RS availability indicator is shown in the idle / inactive mode according to an embodiment of this disclosure.

[0259] Reference Figure 10The UE can receive a PEI configured based on WUS (e.g., DCI). A PEI configured based on DCI can be transmitted on a PDCCH scrambled with a first RNTI by a CRC. WUS can indicate to the UE that it needs to monitor paging DCI on the PO#n associated with WUS.

[0260] The UE attempts to detect the paging DCI by monitoring the PDCCH on PO#n. The paging DCI can be transmitted on the PDCCH scrambled with a second RNTI by the CRC. The second RNTI can be a P-RNTI. The first RNTI can be the same P-RNTI as the second RNTI, or it can be a different (different type) RNTI than the second RNTI.

[0261] Each of the WUS and Paging DCI may include availability indication information about RSs (e.g., CSI-RS / TRS) in the RRC idle / inactive mode. As an example, both the WUS and Paging DCI may include availability indication information about RSs of the same (type / configuration). However, the WUS and Paging DCI may be permitted to include availability indication information about RSs of different (type / configuration). Figure 10 RS A01, A02 and A03 shown can all be RS of the same type / configuration, or they can be RS of different types / configurations.

[0262] As described above, the WUS may include an RS availability indication for duration A (the duration preceding the relevant PO#n). As an example, the WUS may include availability indication information regarding RS A01, which is transmitted via the same beam as the WUS or is subject to QCL assumptions. The WUS may not include availability indication information regarding RS A02, which is transmitted via a different beam than the WUS or is not subject to QCL assumptions.

[0263] The paging DCI may include availability indication information about RS A03 within duration B. As an example, duration B may correspond to one or more DRX cycles or a period of time slots / frames (starting from the time the paging DCI is acquired). As an example, the paging DCI may provide availability indication information about RS A03 regardless of the beam direction or QCL assumption of RS A03 within duration B.

[0264] Information regarding availability indications provided via WUS and paging DCI can be differentiated by considering the characteristics and usage of each transmission signal / channel, as described above, to increase the UE's energy efficiency gains and reduce unnecessary signaling overhead.

[0265] Figure 11 A DCI-based RS availability indication method according to an embodiment of this disclosure is shown. Figure 11In this context, it is assumed that the RS availability indication provides multiple RNTIs, including RNTI#1 and RNTI#2.

[0266] Reference Figure 11 The UE performs PDCCH monitoring based on the RNTI (B01). For example, when multiple RNTIs are configured for the search space, the UE can perform blind detection of PDCCH candidates based on multiple RNTIs. For example, the UE can use the first RNTI to check the CRC of PDCCH candidate #1 and the second RNTI to check the CRC of PDCCH candidate #2. Since the RNTI used for CRC checking only changes for the same PDCCH candidate, the processing burden of the UE related to blind decoding can be minimized. When the CRC check is successful, the UE can determine that a DCI has been sent, i.e., a PDCCH has been detected, based on the RNTI (B05).

[0267] When a PDCCH is detected based on the first RNTI, the UE may attempt RS reception according to the first RS reception procedure (B15). When a PDCCH is detected based on the second RNTI, the UE may attempt RS reception according to the second RS reception procedure (B20).

[0268] According to the implementation method, the first RS receiving process and the second RS receiving process may be related to RS of the same type / configuration / purpose, or they may be related to RS of different types / configurations / purposes.

[0269] The first RS receiving procedure / second RS receiving procedure can be performed based on the RS availability indication included in the DCI, using RNTI.

[0270] For example, a DCI based on the first RNTI could be PEI(WUS), and a DCI based on the second RNTI could be a paging DCI.

[0271] In a specific method applicable to Proposal A, when multiple availability indications can be sent via WUS, at least one message is used to notify that information about the availability indication will be provided in the paging DCI. For example, when WUS (PEI) information is configured via DCI and sent / received on PDCCH, at least one bit of the DCI can be used to indicate that the UE can detect the expected availability indication information about TRS at the location of the associated PO that the UE can be instructed to monitor (via paging DCI) via WUS. Even when there is no paging message to be received, this allows the UE monitoring the PEI to obtain information about the availability indication provided only via paging DCI by monitoring the PO. In this case, when the UE is instructed to monitor the PO to receive CSI-RS / TRS information via WUS, but is instructed not to send / receive a paging message for the UE, the UE can perform blind detection of PDCCH only at the location of the PO and skip the initial operation of PDSCH reception, thereby gaining energy-saving gains. The DCI bits monitored by the PO can be used not only to notify the acquisition of CSI-RS / TRS information in the paging DCI, but also to indicate other information that can be sent on the PO (e.g., SI update indication, ETWS / CMAS notification, etc.).

[0272] As an implementation of application proposal A, when the WUS is configured with an N-bit DCI, at least 2 bits included therein are available for proposal A. Of these at least 2 bits, 1 bit is used to indicate the availability of CSI-RS / TRS, which assumes the same QCL as the WUS, during the duration between the WUS and the PO, and the other bit is used to indicate the monitoring of the paging PDCCH at the location of the PO.

[0273] Additionally, as an example of a paging DCI, N bits of the paging DCI can be used for proposal A. For this purpose, reserved bits in the paging DCI and / or reserved bits in the short message field can be used.

[0274] Figure 12 The flowchart of a signal transmission / reception method according to an embodiment of the present disclosure is shown. Figure 12 These are at least some of the application / implementation examples of the above proposals. Redundant descriptions will be omitted, and reference to the above descriptions may be made as needed.

[0275] Reference Figure 12 The BS can transmit the configuration (C05) of the reference signal for the UE in Radio Resource Control (RRC) idle mode or RRC inactive mode. The UE can obtain the configuration of the reference signal for RRC idle mode or RRC inactive mode.

[0276] The BS can transmit information indicating the availability of the configured reference signal (C10). The BS can transmit information indicating the availability of the reference signal via a specific signal. The specific signal can be the first downlink control information (DCI) carried on the Physical Downlink Control Channel (PDCCH) transmitted in RRC idle mode or RRC inactive mode.

[0277] The UE can determine the availability of the configured reference signal (C15). The UE can determine the availability of the reference signal based on a specific signal received from the BS. This specific signal may be the first DCI carried by the PDCCH detected in RRC idle mode or RRC inactive mode.

[0278] The BS can transmit a reference signal to the UE in RRC idle mode or RRC inactive mode based on the availability of the reference signal and the configuration of the acquired reference signal (C20). The BS can periodically transmit the reference signal to the UE in RRC idle mode or RRC inactive mode based on a first DCI indicating that the reference signal is available.

[0279] The UE can receive the reference signal in RRC idle mode or RRC inactive mode based on the determination of the availability of the reference signal and the configuration of the acquired reference signal. Based on the first DCI indicating the availability of the reference signal, the UE can assume that it will periodically receive the reference signal in RRC idle mode or RRC inactive mode.

[0280] The PDCCH carrying the first DCI can be detected based on the Paging-Radio Network Temporary Identifier (P-RNTI).

[0281] The first DCI can be a paging DCI or a specific DCI that indicates that a paging DCI will be provided at the paging time (PO).

[0282] A specific DCI may include information about the paging DCI, such as whether the paging DCI includes information indicating the availability of a reference signal.

[0283] A specific DCI can indicate the availability of a reference signal for a specific duration, where the end of the specific duration may be related to the location of the PO.

[0284] The configuration of the reference signal may include information about the periodicity of the reference signal.

[0285] The reference signal can be configured through the System Information Block (SIB).

[0286] The configuration of the reference signal can be the same as the configuration in RRC connected mode. Even when the UE enters RRC idle mode or RRC inactive mode, the UE can still receive the reference signal in RRC idle mode or RRC disabled mode by maintaining the configuration of the acquired reference signal.

[0287] The first DCI can indicate the availability of the reference signal through a short message field configured based on the 3rd Generation Partnership Project (3GPP).

[0288] The reference signal may include at least one of the channel state information-reference signal (CSI-RS) or the tracking reference signal (TRS).

[0289] The various descriptions, functions, processes, proposals, methods and / or operation flowcharts of this disclosure can be applied to (but are not limited to) various fields where wireless communication / connectivity (e.g., 5G) is required between devices.

[0290] Specific examples will be described in detail with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise indicated, the same reference numerals may denote the same or corresponding hardware blocks, software blocks, or functional blocks.

[0291] Figure 13 A communication system 1 applied to this disclosure is shown.

[0292] Reference Figure 13 The communication system 1 applied to this disclosure includes wireless devices, base stations (BS), and networks. Herein, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G New RAT (NR) or Long Term Evolution (LTE)) and may be referred to as a communication / radio / 5G device. Wireless devices may include (but are not limited to) robots 100a, vehicles 100b-1 and 100b-2, extended reality (XR) devices 100c, handheld devices 100d, home appliances 100e, Internet of Things (IoT) devices 100f, and artificial intelligence (AI) devices / servers 400. For example, vehicles may include vehicles with wireless communication capabilities, autonomous vehicles, and vehicles capable of performing communication between vehicles. Herein, vehicles may include unmanned aerial vehicles (UAVs) (e.g., drones). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices, and may take the form of head-mounted displays (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Handheld devices may include smartphones, smart tablets, wearable devices (e.g., smartwatches or smart glasses) and computers (e.g., laptops). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, the BS and network may be implemented as wireless devices, and a particular wireless device 200a may operate as a BS / network node relative to other wireless devices.

[0293] Wireless devices 100a to 100f can connect to network 300 via BS200. AI technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can connect to AI server 400 via network 300. Network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although wireless devices 100a to 100f can communicate with each other via BS200 / network 300, wireless devices 100a to 100f can perform direct communication with each other (e.g., sidelink communication) without going through the BS / network. For example, vehicles 100b-1 and 100b-2 can perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). IoT devices (e.g., sensors) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0294] Wireless communication / connections 150a, 150b, or 150c can be established between wireless devices 100a to 100f / BS200 or between BS200 / BS200. In this document, wireless communication / connections can be established via various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). Wireless devices and BS / wireless devices can transmit / receive radio signals to / from each other via wireless communication / connections 150a and 150b. For example, wireless communication / connections 150a and 150b can transmit / receive signals via various physical channels. For this purpose, at least a portion of the configuration information for configuring the process of transmitting / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes can be performed based on various proposals of this disclosure.

[0295] Figure 14 A wireless device applicable to this disclosure is shown.

[0296] Reference Figure 14 The first wireless device 100 and the second wireless device 200 can transmit radio signals via various RATs (e.g., LTE and NR). In this document, {first wireless device 100 and second wireless device 200} can correspond to... Figure 13 {Wireless Device 100x and BS200} and / or {Wireless Device 100x and Wireless Device 100x}.

[0297] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and additionally include one or more transceivers 106 and / or one or more antennas 108. The processors 102 may control the memories 104 and / or the transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate a first information / signal, and then transmit a radio signal including the first information / signal via the transceivers 106. The processor 102 may receive a radio signal including a second information / signal via the transceivers 106, and then store the information obtained by processing the second information / signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information relating to the operation of the processor 102. For example, the memory 104 may store software code including commands for performing some or all of the processes controlled by the processor 102 or for performing the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed herein. In this document, processor 102 and memory 104 may be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). Transceiver 106 may be connected to processor 102 and transmit and / or receive radio signals via one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. Transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In embodiments of this disclosure, a wireless device may represent a communication modem / circuit / chip.

[0298] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and additionally include one or more transceivers 206 and / or one or more antennas 208. The processors 202 may control the memories 204 and / or the transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processors 202 may process information in the memories 204 to generate a third information / signal, and then transmit a radio signal including the third information / signal via the transceivers 206. The processors 202 may receive a radio signal including a fourth information / signal via the transceivers 206, and then store the information obtained by processing the fourth information / signal in the memories 204. The memories 204 may be connected to the processors 202 and may store various information relating to the operation of the processors 202. For example, the memories 204 may store software code including commands for executing some or all of the processes controlled by the processors 202 or for executing the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. In this document, processor 202 and memory 204 may be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). Transceiver 206 may be connected to processor 202 and transmit and / or receive radio signals via one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. Transceiver 206 may be used interchangeably with an RF unit. In embodiments of this disclosure, a wireless device may represent a communication modem / circuit / chip.

[0299] The hardware elements of wireless devices 100 and 200 will be described in more detail below. One or more protocol layers may be implemented by (but are not limited to) one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information, according to the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive signals (e.g., baseband signals) and acquire PDUs, SDUs, messages, control information, data, or information from one or more transceivers 106 and 206, according to the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document.

[0300] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field-programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204 to be driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document can be implemented using firmware or software in the form of code, commands, and / or command sets.

[0301] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and / or commands. One or more memories 104 and 204 may be configured with read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard disk drive, registers, cache memory, computer-readable storage media, and / or combinations thereof. One or more memories 104 and 204 may be located internally and / or externally to one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0302] One or more transceivers 106 and 206 may transmit user data, control information, and / or radio signals / channels mentioned in the methods and / or operation flowcharts of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and transmit and receive radio signals. For example, one or more processors 102 and 202 may perform controls to enable one or more transceivers 106 and 206 to transmit user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may perform controls to enable one or more transceivers 106 and 206 to receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document via one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc., from RF band signals to baseband signals for processing by one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc., processed by one or more processors 102 and 202 from baseband signals to RF band signals. For this purpose, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0303] Figure 15 Another example of a wireless device applied to this disclosure is shown. The wireless device may vary depending on usage / service (see reference). Figure 13 It can be realized in various forms.

[0304] Reference Figure 15 Wireless devices 100 and 200 can correspond to Figure 14The wireless devices 100 and 200 are configured with various elements, components, units / parts, and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include... Figure 14 One or more processors 102 and 202 and / or one or more memories 104 and 204. For example, transceiver 114 may include Figure 14 The device comprises one or more transceivers 106 and 206 and / or one or more antennas 108 and 208. Control unit 120 is electrically connected to communication unit 110, memory unit 130, and add-on components 140, and controls the overall operation of the wireless device. For example, control unit 120 may control the electrical / mechanical operation of the wireless device based on programs / code / commands / information stored in memory unit 130. Control unit 120 may transmit information stored in memory unit 130 to an external source (e.g., other communication devices) via communication unit 110 through a wireless / wired interface, or store information received from an external source (e.g., other communication devices) via communication unit 110 in memory unit 130 via a wireless / wired interface.

[0305] The additional component 140 can be configured differently depending on the type of wireless device. For example, the additional component 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured according to (but is not limited to) a robot. Figure 13 100a), vehicles ( Figure 13 100b-1 and 100b-2), XR device ( Figure 13 100c), handheld device ( Figure 13 100d), home appliances ( Figure 13 100e), IoT devices ( Figure 13 100f), digital broadcasting terminals, holographic devices, public safety devices, MTC devices, medical devices, fintech devices (or financial devices), security devices, climate / environmental devices, AI servers / devices ( Figure 13 400), BS ( Figure 13 This can be achieved through 200 network nodes, etc. Wireless devices can be used in mobile or fixed locations depending on the use case / service.

[0306] exist Figure 15In wireless devices 100 and 200, all elements, components, units / parts, and / or modules may be interconnected via wired interfaces, or at least a portion thereof may be wirelessly connected via communication unit 110. For example, in each of wireless devices 100 and 200, control unit 120 and communication unit 110 may be wired connected, and control unit 120 and first units (e.g., 130 and 140) may be wirelessly connected via communication unit 110. The various elements, components, units / parts, and / or modules within wireless devices 100 and 200 may also include one or more elements. For example, control unit 120 may be configured as a collection of one or more processors. As an example, control unit 120 may be configured as a collection of communication control processors, application processors, electronic control units (ECUs), graphics processing units, and memory control processors. As another example, memory unit 130 may be configured as random access memory (RAM), dynamic RAM (DRAM), read-only memory (ROM), flash memory, volatile memory, non-volatile memory, and / or combinations thereof.

[0307] Figure 16 The illustration shows a vehicle or autonomous vehicle applicable to this disclosure. The vehicle or autonomous vehicle may be a mobile robot, car, train, manned / unmanned aerial vehicle (AV), vessel, etc.

[0308] Reference Figure 16 The vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110 / 130 / 140a to 140d respectively correspond to... Figure 15 Blocks 110 / 130 / 140.

[0309] Communication unit 110 can send and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. Control unit 120 can perform various operations by controlling the components of the vehicle or autonomous vehicle 100. Control unit 120 may include an electronic control unit (ECU). Drive unit 140a enables the vehicle or autonomous vehicle 100 to move on a road. Drive unit 140a may include an engine, motor, powertrain, wheels, brakes, steering mechanism, etc. Power supply unit 140b can supply power to the vehicle or autonomous vehicle 100 and includes wired / wireless charging circuitry, battery, etc. Sensor unit 140c can acquire vehicle status, surrounding environment information, user information, etc. Sensor unit 140c may include inertial measurement unit (IMU) sensors, collision sensors, wheel sensors, speed sensors, slope sensors, weight sensors, heading sensors, position modules, vehicle forward / reverse sensors, battery sensors, fuel sensors, tire sensors, steering sensors, temperature sensors, depth sensors, ultrasonic sensors, lighting sensors, pedal position sensors, etc. Autonomous driving unit 140d can implement technologies for maintaining the vehicle within its lane, technologies for automatically adjusting speed (e.g., adaptive cruise control), technologies for autonomously driving along a determined path, and technologies for automatically setting a route if a destination is set, etc.

[0310] For example, communication unit 110 can receive map data, traffic information data, etc., from an external server. Autonomous driving unit 140d can generate an autonomous driving path and driving plan from the acquired data. Control unit 120 can control drive unit 140a, enabling the vehicle or autonomous vehicle 100 to move along the autonomous driving path according to the driving plan (e.g., speed / direction control). During autonomous driving, communication unit 110 can periodically or non-periodically acquire recent traffic information data from an external server and acquire surrounding traffic information data from neighboring vehicles. During autonomous driving, sensor unit 140c can acquire vehicle status and / or surrounding environment information. Autonomous driving unit 140d can update the autonomous driving path and driving plan based on newly acquired data / information. Communication unit 110 can transmit information about vehicle location, autonomous driving path, and / or driving plan to an external server. The external server can predict traffic information data using AI technology, etc., based on information collected from the vehicle or autonomous vehicle, and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0311] Figure 17 This is a diagram illustrating the DRX operation of a UE according to an embodiment of the present disclosure.

[0312] The UE can perform DRX operation within the procedures and / or methods described / presented above. A UE configured with DRX can reduce power consumption by discontinuously receiving DL signals. DRX can be performed in the RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states. The UE performs DRX in the RRC_IDLE and RRC_INACTIVE states to receive paging signals discontinuously. DRX in the RRC_CONNECTED state (RRC_CONNECTED DRX) will be described below.

[0313] Reference Figure 17 The DRX cycle includes an on-duration period and a DRX opportunity. The DRX cycle defines the duration between periodic repetitions of the on-duration period. The on-duration period is the time period during which the UE monitors the PDCCH. When the UE is configured with DRX, the UE performs PDCCH monitoring during the on-duration period. When the UE successfully detects a PDCCH during the PDCCH monitoring period, the UE starts an inactivity timer and remains awake. Conversely, when the UE fails to detect any PDCCH during the PDCCH monitoring period, the UE transitions to a sleep state after the on-duration period. Therefore, when DRX is configured, PDCCH monitoring / reception can be performed discontinuously in the time domain within the processes and / or methods described / presented above. For example, when DRX is configured, the PDCCH reception opportunity (e.g., a time slot with a PDCCH SS) can be configured discontinuously according to the DRX configuration in embodiments of this disclosure. Conversely, when DRX is not configured, PDCCH monitoring / reception can be performed continuously in the time domain. For example, when DRX is not configured, the PDCCH reception opportunity (e.g., a time slot with a PDCCH SS) can be configured continuously in embodiments of this disclosure. Regardless of whether DRX is configured, PDCCH monitoring can be limited during the time period configured as a measurement interval.

[0314] Table 7 describes the DRX operation of the UE (in RRC_CONNECTED state). Referring to Table 7, DRX configuration information is received via higher-layer signaling (e.g., RRC signaling), and DRX is controlled to be on / off via DRX commands from the MAC layer. Once DRX is configured, the UE can perform PDCCH monitoring discontinuously while executing the procedures and / or methods described / presented above.

[0315] [Table 7]

[0316]

[0317] MAC-CellGroupConfig includes the configuration information required to configure MAC parameters for a cell group. MAC-CellGroupConfig may also include DRX configuration information. For example, when defining a DRX, MAC-CellGroupConfig may include the following information.

[0318] The value of -drx-OnDurationTimer defines the duration of the starting period of the DRX loop.

[0319] The value of -drx-InactivityTimer defines the duration of the time period after the UE is woken up following the detection of a PDCCH timing that indicates the initial UL or DL ​​data.

[0320] The value of -drx-HARQ-RTT-TimerDL defines the maximum time period from the initial DL transmission received until a DL retransmission is received.

[0321] The value of -drx-HARQ-RTT-TimerDL defines the maximum duration of the time period from receiving the initial UL transmission permission until receiving the UL retransmission permission.

[0322] -drx-LongCycleStartOffset: Defines the duration and start time of the DRX loop.

[0323] -drx-ShortCycle (optional): Defines the duration of a short DRX cycle.

[0324] When any of drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, and drx-HARQ-RTT-TimerDL are running, the UE performs PDCCH monitoring at each PDCCH timing and remains in the wake-up state.

[0325] The above embodiments correspond to combinations of the elements and features of this disclosure in a prescribed form. Furthermore, unless explicitly stated otherwise, each element or feature may be considered optional. Each element or feature may be implemented without combination with other elements or features. Moreover, embodiments of this disclosure can be implemented by partially combining elements and / or features together. The order of operations described for each embodiment of this disclosure may be modified. Some configurations or features of one embodiment may be included in another embodiment, or may replace corresponding configurations or features of another embodiment. Furthermore, embodiments may be configured by combining claims not explicitly referenced in the appended claims, or may be included as new claims after filing the application.

[0326] Those skilled in the art will understand that this disclosure may be practiced in other specific forms besides those set forth herein without departing from the spirit and essential characteristics of this disclosure. Therefore, the above embodiments should be construed in all respects as illustrative rather than restrictive. The scope of this disclosure should be determined by the appended claims and their legal equivalents, and not by the foregoing description, and all changes falling within the meaning and scope of the appended claims are intended to be covered therewith.

[0327] Industrial applicability

[0328] This disclosure applies to UE, BS or other devices in wireless mobile communication systems.

Claims

1. A method executed by a terminal, the method comprising the following steps: Receive configuration of the Tracking Reference Signal (TRS) for Radio Resource Control (RRC) idle mode or RRC inactive mode via higher-layer signaling; The downlink control information (DCI), including TRS availability indication information, is received based on the Paging-Radio Network Temporary Identifier (P-RNTI). as well as Based on the TRS availability indication information and the configuration for the TRS, the TRS is received in the RRC idle mode or the RRC inactive mode. The configuration for the TRS includes information for multiple TRS resource sets. The TRS availability indication information indicates the availability of one or more TRS resource sets based on one or more identifier IDs for one or more TRS resource sets, and Of these, N bits are used to indicate the TRS availability indication information and are associated with one or more IDs.

2. The method according to claim 1, wherein, The terminal obtains information about the specific duration for which the TRS can be configured, based on the configuration for the TRS and the TRS availability indication information.

3. The method according to claim 1, wherein, The TRS availability indication information is provided for a specific duration. The end of the specific duration is related to the location of the paging timing PO.

4. The method according to claim 1, wherein, The configuration for the TRS is received via the System Information Block (SIB).

5. The method according to claim 1, wherein, The configuration for the TRS was received in RRC connection mode. Wherein, after the terminal enters the RRC idle mode or the RRC inactive mode, the terminal receives the TRS in the RRC idle mode or the RRC inactive mode by maintaining the received configuration for the TRS.

6. An apparatus comprising: Memory configured to store instructions; as well as A processor configured to execute the instructions to perform the operation. The operations of the processor include: Receive configuration of the Tracking Reference Signal (TRS) for Radio Resource Control (RRC) idle mode or RRC inactive mode via higher-layer signaling; Receive downlink control information (DCI) including TRS availability indication information based on the Paging-Radio Network Temporary Identifier (P-RNTI); and Based on the TRS availability indication information and the configuration for the TRS, the TRS is received in the RRC idle mode or the RRC inactive mode. The configuration for the TRS includes information for multiple TRS resource sets. The TRS availability indication information indicates the availability of one or more TRS resource sets based on one or more identifier IDs for one or more TRS resource sets, and Of these, N bits are used to indicate the TRS availability indication information and are associated with one or more IDs.

7. The apparatus according to claim 6, further comprising: transceiver The device in question is a user equipment (UE) in a wireless communication system.

8. A method performed by a base station, the method comprising the following steps: The configuration of the Tracking Reference Signal (TRS) for Radio Resource Control (RRC) idle mode or RRC inactive mode is sent to the terminal via higher-layer signaling. Generate downlink control information (DCI) that includes the TRS availability indication information of the reference signal; The DCI is sent to the terminal in the RRC idle mode or the RRC inactive mode based on the Paging-Radio Network Temporary Identifier (P-RNTI). as well as Based on the TRS availability indication information and the configuration for the TRS, the TRS is sent to the terminal in the RRC idle mode or the RRC inactive mode. The configuration for the TRS includes information for multiple TRS resource sets. The TRS availability indication information indicates the availability of one or more TRS resource sets based on one or more identifier IDs for one or more TRS resource sets, and Of these, N bits are used to indicate the TRS availability indication information and are associated with one or more IDs.

9. A base station, the base station comprising: transceiver; as well as A processor configured to control the transceiver: The configuration of the Tracking Reference Signal (TRS) for Radio Resource Control (RRC) idle mode or RRC inactive mode is sent to the terminal via higher-layer signaling. Generate downlink control information (DCI) that includes the TRS availability indication information of the reference signal; The DCI is sent to the terminal in the RRC idle mode or the RRC inactive mode based on the Paging-Radio Network Temporary Identifier (P-RNTI). and Based on the TRS availability indication information and the configuration for the TRS, the TRS is sent to the terminal in the RRC idle mode or the RRC inactive mode. The configuration for the TRS includes information for multiple TRS resource sets. The TRS availability indication information indicates the availability of one or more TRS resource sets based on one or more identifier IDs for one or more TRS resource sets, and Of these, N bits are used to indicate the TRS availability indication information and are associated with one or more IDs.

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